This is a single center case-control study based on routine care, designed to recruit patients with type 1 diabetes mellitus free from any other myocardiopathy. The inclusion will take place over a period of 24 months. No monitoring of patients (no follow-up) is provided under this protocol. The analysis will focus on the combination of the left ventricle myocardial deformations alteration revealed by the echocardiographic 2D strain analysis (< 18% in absolute value), with the existence of micro-angiopathy in type 1 diabetes mellitus patients with preserved left ventricular ejection fraction ( ≥ 60%).